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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">area_center_gray</span><span data-if="c" style="display:none;">area_center_gray</span><span data-if="cpp" style="display:none;">AreaCenterGray</span><span data-if="dotnet" style="display:none;">AreaCenterGray</span><span data-if="python" style="display:none;">area_center_gray</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">area_center_gray</span><span data-if="c" style="display:none;">area_center_gray</span><span data-if="cpp" style="display:none;">AreaCenterGray</span><span data-if="dotnet" style="display:none;">AreaCenterGray</span><span data-if="python" style="display:none;">area_center_gray</span></code> — Compute the area and center of gravity of a region in a gray value
image.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>area_center_gray</b>(<a href="#Regions"><i>区域</i></a>, <a href="#Image"><i>Image</i></a> :  :  : <a href="#Area"><i>Area</i></a>, <a href="#Row"><i>Row</i></a>, <a href="#Column"><i>Column</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>area_center_gray</b>(const Hobject <a href="#Regions"><i>区域</i></a>, const Hobject <a href="#Image"><i>Image</i></a>, double* <a href="#Area"><i>Area</i></a>, double* <a href="#Row"><i>Row</i></a>, double* <a href="#Column"><i>Column</i></a>)</code></p>
<p>
<code>Herror <b>T_area_center_gray</b>(const Hobject <a href="#Regions"><i>区域</i></a>, const Hobject <a href="#Image"><i>Image</i></a>, Htuple* <a href="#Area"><i>Area</i></a>, Htuple* <a href="#Row"><i>Row</i></a>, Htuple* <a href="#Column"><i>Column</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>AreaCenterGray</b>(const HObject&amp; <a href="#Regions"><i>区域</i></a>, const HObject&amp; <a href="#Image"><i>Image</i></a>, HTuple* <a href="#Area"><i>Area</i></a>, HTuple* <a href="#Row"><i>Row</i></a>, HTuple* <a href="#Column"><i>Column</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HImage.html">HImage</a>::<b>AreaCenterGray</b>(const HRegion&amp; <a href="#Regions"><i>区域</i></a>, HTuple* <a href="#Row"><i>Row</i></a>, HTuple* <a href="#Column"><i>Column</i></a>) const</code></p>
<p>
<code>double <a href="HImage.html">HImage</a>::<b>AreaCenterGray</b>(const HRegion&amp; <a href="#Regions"><i>区域</i></a>, double* <a href="#Row"><i>Row</i></a>, double* <a href="#Column"><i>Column</i></a>) const</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HRegion.html">HRegion</a>::<b>AreaCenterGray</b>(const HImage&amp; <a href="#Image"><i>Image</i></a>, HTuple* <a href="#Row"><i>Row</i></a>, HTuple* <a href="#Column"><i>Column</i></a>) const</code></p>
<p>
<code>double <a href="HRegion.html">HRegion</a>::<b>AreaCenterGray</b>(const HImage&amp; <a href="#Image"><i>Image</i></a>, double* <a href="#Row"><i>Row</i></a>, double* <a href="#Column"><i>Column</i></a>) const</code></p>
</div>
<div data-if="com" style="display:none;"></div>
<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>AreaCenterGray</b>(<a href="HObject.html">HObject</a> <a href="#Regions"><i>区域</i></a>, <a href="HObject.html">HObject</a> <a href="#Image"><i>image</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Area"><i>area</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Row"><i>row</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Column"><i>column</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HImage.html">HImage</a>.<b>AreaCenterGray</b>(<a href="HRegion.html">HRegion</a> <a href="#Regions"><i>区域</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Row"><i>row</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Column"><i>column</i></a>)</code></p>
<p>
<code>double <a href="HImage.html">HImage</a>.<b>AreaCenterGray</b>(<a href="HRegion.html">HRegion</a> <a href="#Regions"><i>区域</i></a>, out double <a href="#Row"><i>row</i></a>, out double <a href="#Column"><i>column</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HRegion.html">HRegion</a>.<b>AreaCenterGray</b>(<a href="HImage.html">HImage</a> <a href="#Image"><i>image</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Row"><i>row</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Column"><i>column</i></a>)</code></p>
<p>
<code>double <a href="HRegion.html">HRegion</a>.<b>AreaCenterGray</b>(<a href="HImage.html">HImage</a> <a href="#Image"><i>image</i></a>, out double <a href="#Row"><i>row</i></a>, out double <a href="#Column"><i>column</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>area_center_gray</b>(<a href="#Regions"><i>区域</i></a>: HObject, <a href="#Image"><i>image</i></a>: HObject) -&gt; Tuple[Sequence[float], Sequence[float], Sequence[float]]</code></p>
<p>
<code>def <b>area_center_gray_s</b>(<a href="#Regions"><i>区域</i></a>: HObject, <a href="#Image"><i>image</i></a>: HObject) -&gt; Tuple[float, float, float]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">area_center_gray</span><span data-if="c" style="display:none">area_center_gray</span><span data-if="cpp" style="display:none">AreaCenterGray</span><span data-if="com" style="display:none">AreaCenterGray</span><span data-if="dotnet" style="display:none">AreaCenterGray</span><span data-if="python" style="display:none">area_center_gray</span></code> computes the area and center of gravity of
the regions <a href="#Regions"><i><code><span data-if="hdevelop" style="display:inline">区域</span><span data-if="c" style="display:none">区域</span><span data-if="cpp" style="display:none">区域</span><span data-if="com" style="display:none">区域</span><span data-if="dotnet" style="display:none">区域</span><span data-if="python" style="display:none">区域</span></code></i></a> that have gray values which are defined
by the image <a href="#Image"><i><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></i></a>.  This operator is similar to
<a href="area_center.html"><code><span data-if="hdevelop" style="display:inline">area_center</span><span data-if="c" style="display:none">area_center</span><span data-if="cpp" style="display:none">AreaCenter</span><span data-if="com" style="display:none">AreaCenter</span><span data-if="dotnet" style="display:none">AreaCenter</span><span data-if="python" style="display:none">area_center</span></code></a>, but in contrast to that operator, the gray
values of the image are taken into account while computing the area
and center of gravity.
</p>
<p>The area A of a region R in the image with the gray values
g(r,c) is defined as <span title="1" class="displaymath"><!-- Created by MetaPost 1.902 on 2023.05.15:2033 --><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="7.92928em" height="2.6821em" viewBox="0 0 126.868469 42.913620">
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</p>
<p>Note, that in the case where the <a href="#Area"><i><code><span data-if="hdevelop" style="display:inline">Area</span><span data-if="c" style="display:none">Area</span><span data-if="cpp" style="display:none">Area</span><span data-if="com" style="display:none">Area</span><span data-if="dotnet" style="display:none">area</span><span data-if="python" style="display:none">area</span></code></i></a> is zero the row and
column coordinates of the center of gravity are also set to zero.
</p>
<h2 id="sec_attention">注意</h2>
<p>Note that 该算子 <code><span data-if="hdevelop" style="display:inline">area_center_gray</span><span data-if="c" style="display:none">area_center_gray</span><span data-if="cpp" style="display:none">AreaCenterGray</span><span data-if="com" style="display:none">AreaCenterGray</span><span data-if="dotnet" style="display:none">AreaCenterGray</span><span data-if="python" style="display:none">area_center_gray</span></code> only considers
the given <a href="#Regions"><i><code><span data-if="hdevelop" style="display:inline">区域</span><span data-if="c" style="display:none">区域</span><span data-if="cpp" style="display:none">区域</span><span data-if="com" style="display:none">区域</span><span data-if="dotnet" style="display:none">区域</span><span data-if="python" style="display:none">区域</span></code></i></a> and ignores any previously set domain
of the input image <a href="#Image"><i><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></i></a>.
<code><span data-if="hdevelop" style="display:inline">area_center_gray</span><span data-if="c" style="display:none">area_center_gray</span><span data-if="cpp" style="display:none">AreaCenterGray</span><span data-if="com" style="display:none">AreaCenterGray</span><span data-if="dotnet" style="display:none">AreaCenterGray</span><span data-if="python" style="display:none">area_center_gray</span></code> can be executed on OpenCL devices if the device
supports the  cl_khr_fp64 and cl_khr_int64_base_atomics OpenCL extensions.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
    
      <li>支持OpenCL计算设备。</li>
    
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  
    <li>在元组级别自动并行化。</li>
  
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="Regions" class="parname"><b><code><span data-if="hdevelop" style="display:inline">区域</span><span data-if="c" style="display:none">区域</span><span data-if="cpp" style="display:none">区域</span><span data-if="com" style="display:none">区域</span><span data-if="dotnet" style="display:none">区域</span><span data-if="python" style="display:none">区域</span></code></b> (input_object)  </span><span>region(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="c" style="display:none">Hobject</span></span>
</div>
<p class="pardesc">Region(s) to be examined.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Image" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></b> (input_object)  </span><span>singlechannelimage <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject</span> (byte* / direction* / cyclic* / int1* / int2* / uint2* / int4* / real*)<i> *allowed for compute devices</i></span>
</div>
<p class="pardesc">Gray value image.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Area" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Area</span><span data-if="c" style="display:none">Area</span><span data-if="cpp" style="display:none">Area</span><span data-if="com" style="display:none">Area</span><span data-if="dotnet" style="display:none">area</span><span data-if="python" style="display:none">area</span></code></b> (output_control)  </span><span>real(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Gray value volume of the region.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Row" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Row</span><span data-if="c" style="display:none">Row</span><span data-if="cpp" style="display:none">Row</span><span data-if="com" style="display:none">Row</span><span data-if="dotnet" style="display:none">row</span><span data-if="python" style="display:none">row</span></code></b> (output_control)  </span><span>point.y(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Row coordinate of the gray value center of gravity.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Column" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Column</span><span data-if="c" style="display:none">Column</span><span data-if="cpp" style="display:none">Column</span><span data-if="com" style="display:none">Column</span><span data-if="dotnet" style="display:none">column</span><span data-if="python" style="display:none">column</span></code></b> (output_control)  </span><span>point.x(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Column coordinate of the gray value center of gravity.</p>
</div>
<h2 id="sec_result">结果</h2>
<p><code><span data-if="hdevelop" style="display:inline">area_center_gray</span><span data-if="c" style="display:none">area_center_gray</span><span data-if="cpp" style="display:none">AreaCenterGray</span><span data-if="com" style="display:none">AreaCenterGray</span><span data-if="dotnet" style="display:none">AreaCenterGray</span><span data-if="python" style="display:none">area_center_gray</span></code> returns <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
     if all parameters are correct
and no error occurs during execution.  If the input is empty the
behavior can be set via
<a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system(::'no_object_result',&lt;Result&gt;:)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>.  If
necessary, an exception is raised.</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="threshold.html"><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></a></code>, 
<code><a href="regiongrowing.html"><span data-if="hdevelop" style="display:inline">regiongrowing</span><span data-if="c" style="display:none">regiongrowing</span><span data-if="cpp" style="display:none">Regiongrowing</span><span data-if="com" style="display:none">Regiongrowing</span><span data-if="dotnet" style="display:none">Regiongrowing</span><span data-if="python" style="display:none">regiongrowing</span></a></code>, 
<code><a href="connection.html"><span data-if="hdevelop" style="display:inline">connection</span><span data-if="c" style="display:none">connection</span><span data-if="cpp" style="display:none">Connection</span><span data-if="com" style="display:none">Connection</span><span data-if="dotnet" style="display:none">Connection</span><span data-if="python" style="display:none">connection</span></a></code>
</p>
<h2 id="sec_alternatives">可替代算子</h2>
<p>
<code><a href="area_center.html"><span data-if="hdevelop" style="display:inline">area_center</span><span data-if="c" style="display:none">area_center</span><span data-if="cpp" style="display:none">AreaCenter</span><span data-if="com" style="display:none">AreaCenter</span><span data-if="dotnet" style="display:none">AreaCenter</span><span data-if="python" style="display:none">area_center</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="area_center_xld.html"><span data-if="hdevelop" style="display:inline">area_center_xld</span><span data-if="c" style="display:none">area_center_xld</span><span data-if="cpp" style="display:none">AreaCenterXld</span><span data-if="com" style="display:none">AreaCenterXld</span><span data-if="dotnet" style="display:none">AreaCenterXld</span><span data-if="python" style="display:none">area_center_xld</span></a></code>, 
<code><a href="elliptic_axis_gray.html"><span data-if="hdevelop" style="display:inline">elliptic_axis_gray</span><span data-if="c" style="display:none">elliptic_axis_gray</span><span data-if="cpp" style="display:none">EllipticAxisGray</span><span data-if="com" style="display:none">EllipticAxisGray</span><span data-if="dotnet" style="display:none">EllipticAxisGray</span><span data-if="python" style="display:none">elliptic_axis_gray</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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